public Task<Position> GetPositionAsync (int timeout, bool includeHeading)
{
if (timeout < 0)
throw new ArgumentOutOfRangeException ("timeout");
// The built in timeout does not cancel, it throws an exception, so we'll setup our own.
IAsyncOperation<Geoposition> pos = GetGeolocator().GetGeopositionAsync (TimeSpan.Zero, TimeSpan.FromDays (365));
Timeout timer = new Timeout (timeout, pos.Cancel);
var tcs = new TaskCompletionSource<Position>();
pos.Completed = (op, s) =>
{
timer.Cancel();
switch (s)
{
case AsyncStatus.Canceled:
tcs.SetCanceled();
break;
case AsyncStatus.Completed:
tcs.SetResult (GetPosition (op.GetResults()));
break;
case AsyncStatus.Error:
Exception ex = op.ErrorCode;
if (ex is UnauthorizedAccessException)
ex = new GeolocationException (GeolocationError.Unauthorized, ex);
tcs.SetException (ex);
break;
}
};
return tcs.Task;
}
public Task<Position> GetPositionAsync (int timeout, CancellationToken token, bool includeHeading)
{
if (timeout < 0)
throw new ArgumentOutOfRangeException ("timeout");
IAsyncOperation<Geoposition> pos = GetGeolocator().GetGeopositionAsync (TimeSpan.FromTicks (0), TimeSpan.FromDays (365));
token.Register (o => ((IAsyncOperation<Geoposition>)o).Cancel(), pos);
Timeout timer = new Timeout (timeout, pos.Cancel);
var tcs = new TaskCompletionSource<Position>();
pos.Completed = (op, s) =>
{
timer.Cancel();
switch (s)
{
case AsyncStatus.Canceled:
tcs.SetCanceled();
break;
case AsyncStatus.Completed:
tcs.SetResult (GetPosition (op.GetResults()));
break;
case AsyncStatus.Error:
Exception ex = op.ErrorCode;
if (ex is UnauthorizedAccessException)
ex = new GeolocationException (GeolocationError.Unauthorized, ex);
tcs.SetException (ex);
break;
}
};
return tcs.Task;
}